SVP,AIDEZ MOI A FAIRE CA. URGENT POUR DEMAIN. MERCI

TS/TR = TA/TB = AS/BR

3/4 = 2,4/TB = AS/6

3/4 = 2,4/TB
4*2,4 = 3*TB
3*TB =9,6
TB = 3,2


TA/TB = AS/BR
3/3,2  = AS/6
6*2,4 = AS*3,2
AS*3,2 = 14,4
AS = 4,5

3) SA/SC = SB/SD = AB/CD

3/SC = 4/5,5

5,5*3 = 4*SC
16,5  = 4*SC
SC = 4,125  tu arrondirs au mm